CN105072644A

CN105072644A - Method of providing information in cellular wireless communication system

Info

Publication number: CN105072644A
Application number: CN201510548485.2A
Authority: CN
Inventors: 亨里克·奥鲁佛松; 彼得·莱格; 约翰·约翰松; 王学龙
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2010-08-13
Filing date: 2010-08-13
Publication date: 2015-11-18
Anticipated expiration: 2030-08-13
Also published as: CN103517322A; CN105072644B; CN103517322B

Abstract

The invention relates to a method of providing information in a cellular wireless communication system. The method includes the following steps: detecting radio link failure (RLF) of a mobile station when a first cell is connected; re-establishing a connection in a second cell; and re-establishing a connection in a fourth cell, and only providing information related to the radio link failure (RLF) to the fourth cell that supports the same radio access technology (RAT) as the first cell. In addition, the invention relates to a method of a mobile station, a method of a base station, a mobile station device, and a base station device.

Description

For providing the method for information in cellular radio communication system

Technical field

The present invention relates to a kind of for providing the method for information in cellular radio communication system, or or rather, relate to a kind of method of preamble according to claim 1.In addition, the invention still further relates to a kind of method in travelling carriage, a kind of method in base station, a kind of computer program, a kind of computer program, a kind of mobile station apparatus and a kind of base station apparatus.

Background technology

Usually, in cellular radio communication system, be in the travelling carriage (MS) of activity pattern when it moves by system, from a cell merge to next community, and data can transmit and receive, and can not cause obvious interruption because these switch.

Switch (HO) flow process to be made up of some steps.In many cellular radio communication systems, HO is: 1) by network control, and namely when being connected to another community, MS is by network control; 2) prepared, the Target cell that namely MS will move to prepares; And 3) assisted by MS, namely MS is before HO, provides measurement report to Serving cell, prepare with the HO of auxiliary decision Target cell, and leaves the time of Target cell, Serving cell/be connected to.

In the context of HO, the Serving cell before HO is usually called cell-of-origin.After successful HO, Target cell becomes new Serving cell.In Long Term Evolution (LTE), HO is " direct-cut operation ", namely represents that UE wireless link is from (source) cell merge to another (target) community.In Universal Mobile Telecommunications System (UMTS), direct-cut operation is exclusively used in time division duplex (TDD) pattern, but also can be used for Frequency Division Duplexing (FDD) (FDD) pattern.

Hereafter will focus on that LTE is with frequency HO flow process, but for LTE cross wireless access technology (RAT) and LTE alien frequencies HO flow process, its flow process is similar.The E-UTRAN inside be under RRC_CONNECTED state adopts subscriber equipment (UE) auxiliary network control type HO, there is HO and prepare signaling in E-UTRAN.

HO is triggered by the measurement report being sent to service eNB (E-UTRAN NodeB) from UE at first.How service eNB is measured for UE, and measurement report should trigger under which conditions and be sent to eNB, and configures.

In order to auxiliary moving control decision, UE can measure some different communities and by report the test to network.Different networks and network design can have different concrete behaviors, but in most systems, naturally trigger HO when the Signal reception of Target cell is better than the Signal reception of cell-of-origin.

(namely use in the system of same frequency resources) when carrying out with frequently HO in single-point multiplex system (reuse-onesystem) completely in cell-of-origin and Target cell, (always) when keeping UE to be connected to the community with optimum signal intensity, there is strong jamming management benefit.In measurement report, UE comprises HO and triggers reason, such as, Target cell signal is better than serving cell signal, and to Serving cell with comprise the measurement that the Reference Signal Received Power (RSRP) of some neighbor cells of Target cell or Reference Signal Received Quality (RSRQ) carry out.Reduce ping-pong when UE repeatedly switches between Liang Ge community, then HO skew can be added in HO trigger condition usually: by once offseting, Target cell signal should be better than serving cell signal, wherein deviant >0dB.

When service eNB receives measurement report from UE, and eNB will by UEHO to another community time, then eNB performs and prepares for the HO of this community.HO prepares the signaling related between (service) eNB and another (target) eNB and exchanges.Cell-of-origin request HO (handover request) also ignores UE contextual information; And Target cell determines that it can access UE (access-in management control), and determine it is accept or refusal HO.Accepting in message (switching request acknowledgement message), Target cell comprise UE communicate with Target cell needed for parameter, these parameters are divided in transparent vessel.Cell-of-origin can prepare multiple community to carry out HO.

After success prepares, namely there is HO and perform.Cell-of-origin sends HO order to UE, i.e. RRCConnectionReconfiguration message, and carries transparent vessel.Once UE correctly receives this message, then UE is synchronized to new Target cell, and sends synchronization message by Random Access Channel (RACH).Target cell sends subsequently to UE to be distributed, so that UE can send HO acknowledge message (RRCConnectionReconfiguration-Complete message) to Target cell.

In the final step (switching completes) not relating to UE, data (unacknowledged downlink packet) can be forwarded to target eNB (it serves cell-of-origin) by source eNB (it serves cell-of-origin), and must from converting into target community, cell-of-origin (" path integration " (pathswitch)) from the S1-U interface of gateway (S-GW).Finally, if handover success, then target eNB sends UE context release message to source eNB.

But due to Radio Link Failure (RLF) or RACH failure, HO may failure on difference.RACH failure during HO is called " handoff failure " in 3GPPTS36.331, but for remainder herein, term " HO failure " comprises RLF failure and RACH failure simultaneously.

After HO failure, UE attempts carrying out the RRC described in specification 3GPPTS36.300 and 3GPPTS36.331 and rebuilds.First, UE attempts finding its Qiang community that can detect (" community selection "), and then UE sends RRCConnection-ReestablishmentRequest to the community selected by it.If selected community has the prior knowledge about UE, and about UE connect details (such as, security parameter, this is called " UE context "), so this community can send RRCConnectionReestablishment, then successfully rebuild, namely represent that UE remains in wireless heterogeneous networks (RRC) connected state.

But if lack UE context, so the request of rebuilding is refused, and UE transfers RRC Idle state to, thus causes, before UE transfers RRC connected state to and restarts any data communication, postponing further." UE context " can send community to during HO flow process or on some other time point.This transmission is called that HO prepares.Note also, RRCConnectionReestablishmentRequest carries three fields, namely there is the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (C-RNTI) of the UE in failed Serving cell, the Physical Cell Identifier (PCI) of this community, and the shortMAC-I that the mark (ID) of passing through to rebuild community calculates.

Hard HO in Universal Mobile Telecommunications System (UMTS) is all closely similar with above-mentioned explanation in a lot, is namely also assisted by UE and by network control, this represents that UE is for sending the measurement report triggered, and network determines the time performing HO; (using wireless link flow process) prepares; Be " backward " HO, this represents that cell-of-origin sends HO order to UE, and UE replys Target cell; And completed by signaling between node.

In addition, RLF is described in specification 3GPPTS36.300 and 3GPPTS36.331.The detection of loss of mains that a kind of RLF of form is performed by layer 1 drives.When UE indicates from continuous " step-out " of lower level reception specific quantity, start wireless issue testing process.The quantity of continuous instruction is specified by threshold value N310.When this situation occurs, UE starts timer T310.Receive continuous " synchronously " instruction of specific quantity (N311) at UE from lower level, when T310 runs simultaneously, UE should stop timer, and returns normal operating condition.

After statement RLF, UE attempts carrying out community selection.If UE attempted to find the community that will be connected in the choice phase of community, so UE will attempt rebuilding RRC to this community.On the other hand, if UE does not find community within the community choice phase (T311), so UE returning to idle mode, and can start to find the community on other RAT, such as, LTE, UMTS, WiMaX, and GSM EDGE radio access network (GERAN).

When reaching greatest maximum number of transmissions with transmit uplink RRC signaling bag, but when described bag transmits successful not yet, RLF also states by wireless spread-spectrum technology (RLC) layer of UE.In addition, if during HO, random access failure (T304 time-out), so UE situation about showing as when occurring with RLF is identical.Term " RLF " herein refers to above-mentioned any one event.

In addition, RLF report is introduced into 3GPPRel-9 and distinguishes between the problem relating to mobile robustness optimization (MRO) and coverage problems to make the eNB of reception RLF report.When this indicates unsuccessfully by adding, one group of neighbor cell measurement of signal strength signal intensity has come.Whereby, eNB can check the substituting neighbor cell whether existing and may use, or any neighbor cell whether do not detected when existing and covering cavity.

RLF report carries the information about following aspect:

Serving cell RSRP, and optional RSRQ;

Neighbor cell RSRP/RSRQ; And

Also the intensity of the interactive RAT neighbor cell detected can be indicated.

In Rel-9, if the RLF during HO successfully carries out RRC reconstruction after occurring, then may comprise RLF report in RLFINDICATION message, wherein said RLFINDICATION message is sent to when RLF occurs just at the eNB of service UE from the eNB occurring to rebuild.UE provides the performance of RLF report to be indicated by the mark in RCConnectionReestablishmentComplete message.RLF report is supplied to subsequently and wherein uses UE information flow to carry out the eNB rebuild.

A remaining problems in Rel-9 is that UE just can only send RLF report when RRC rebuilds successfully.Further, this situation only may the appearance when receiving the community of RLF report and have context (being HO " preparations ") of this UE.Under most of HO failure scenarios, because HO performed evening, and wherein UE to attempt carrying out the community of RRC reconstruction offhand, therefore UE cannot send RLF report.

In order to relax this situation, there are some of the recommendations for also carrying out RLF report after UE returning to idle mode.This represents, UE reports when RRC is set up in trial.

In addition, in 3 gpp, large quantity research has been carried out to the self-organizing network (SON) of LTE.This part is wherein handoff parameter optimization, above also referred to as MRO, is intended to optimize moving parameter.Although not yet specify the HO parameter that should be optimized, the example comprises HO sluggishness (also referred to as skew) and triggered time (TTT) parameter.The object optimized is, reduces HO failure, reduces unnecessary HO simultaneously.MRO function is distributed in Evolved UTRAN (E-UTRAN), and namely each eNB has respective MRO optimization function.In order to auxiliary optimization, signaling is also determined between eNB, to help to identify HO turkey.

Described below is the use-case that handoff parameter is optimized, described handoff parameter optimization is also referred to as MRO in Section 22.5 of specification 3GPPTS36.300,9.2.0:

One of function of mobile robustness optimization [MRO] is, detects because of too early or spend evening and cross switching in evening, or the RLF being switched to wrong cell and causing.The implementing procedure of this testing mechanism is as follows:

-[crossing late HO] is if after there is RLF in eNBA place, and UE attempts rebuilding wireless link at eNBB place, and so eNBB indicates flow process by this RLF event report to eNBA by RLF.

-[too early HO] is once eNBB receives RLF instruction from eNBA, and eNBB has sent to eNBA and completes the relevant UE context release message of the HO that is about to carry out with in last Tstore_UE_cntxt second for same UE, then eNBB can send the handover report message that indicate too early HO event to eNBA.

-[HO is to wrong cell] receives RLF instruction once eNBB from eNBC, and eNBB has sent to eNBA and completes the relevant UE context release message of the HO that is about to carry out with in last Tstore_UE_cntxt second for same UE, then eNBB can send the handover report message of expression HO to wrong cell event to eNBA.If eNBB with eNBC is identical, and RLF report is in the inside of this eNB, then also may send instruction.

The detection of above-mentioned event is realized by RLF instruction and handover report flow process.

RLF indicates that flow process can occur after RLF at eNBA place, UE attempts starting after eNBB place reconstruction wireless link.The RLF Indication message being sent to eNBA from eNBB should comprise following information element:

-failed community ID: the PCI that the community of RLF occurs:

-rebuild community ID: the ECGI attempting carrying out the community of RL reconstruction;

-C-RNTI: the C-RNTI that the UE in the community of RLF occurs.

-shortMAC-I (optional): 16 least significant bits of the MAC-I calculated by security configuration and the reconstruction cell ID of cell-of-origin.

ENBB can initiate RLF instruction to multiple eNB, and prerequisite is the community that these eNB control the PCI using UE to be sent by signal during rebuilding flow process.ENBA selects the UE context mated with received failed community PCI and C-RNTI, and if passable, use shortMAC-I to confirm that this identify, method is, it also compares with received IE by calculating shortMAC-I.

When Target cell (in eNBB) to after source eNBA sends UE context release message soon, when in Target cell, (in eNBB) RLF occurs, handover report process uses when completing switching recently.Handover report message comprises following information:

-the type (too early HO, HO are to wrong cell) of switching problem that detects

Cell-of-origin in-switching and the ECGI of Target cell

The ECGI (when HO is to wrong cell) of-reconstruction community

-switch reasons (being sent by signal by source between the switching preparatory stage)

Interactive RAT moves

HO between different RAT, i.e. interactive RATHO, can have different reason.Wherein two examples can be:

Coverage on coverage-current RAT is not enough, and other RAT exist coverage.Therefore UE may be required that HO arrives another RAT;

Capacity in capacity-current RAT may be not enough, but there is active volume in another RAT of covering the same area.

For the interactive RAT based on coverage moves, the signal strength signal intensity that existence two is absolute usually, or signal quality threshold: the standard in source RAT and target RAT.UE expection in LTE system is present in target RAT, target RAT standard can be used for arranging threshold value.Source standard can be used for adjusting the time that UE starts to perform interactive RAT measurement.

The too low meeting of standard of Serving cell causes measuring excessively, and high demarcated standard then can cause call drop (droppedcall), this is because before the quality of Serving cell crosses difference and cannot be used for communication further, UE cannot find any substituting.

According to specification 3GPPTS36.331, the typical event that can be used for measuring configuration is as follows:

Event A1: service is better than threshold value.

Event A2: threshold difference is compared in service.

Event A3: adjacent than the excellent side-play amount of service.

Event A4: be adjacently better than threshold value.

Event A5: it is poorer than threshold value 1 to serve, and be adjacently better than threshold value 2.

Event B1: interactive RAT is adjacent is better than threshold value.

Event B2: it is poorer than threshold value 1 to serve, and interactive RAT is adjacent is better than threshold value 2.

Herein " service " refer to Serving cell or cell-of-origin, and " adjacent " refers to the neighbor cell detected.Cell signal strength (or quality) and fixed threshold compare by different event, or the value of Serving cell and neighbor cell compares (comprising above-mentioned lagged value).

A kind of exemplary embodiment of interactive RATHO algorithm (coverage HO) is as follows:

When the quality of Serving cell is lower than acceptable level, by event A2, start interactive RAT and measure.

Simultaneously by event B1 or B2, allocating and measuring interval (if needs), and configuration UE is to report the community of another RAT.

Interactive RATMRO

The following parameter of interactive RATMRO function adjustable in eNB:

The time (A2) that measurement on other RAT communities starts, and report the time (B2_threshold1) that should be triggered;

Before report, the requirement (B1 and B2_threshold2) of related ends community;

The difference skew of different frequency arranges (described skew is arranged via parameter ofn).

The error situation of interactive RATMRO is slightly different compared with the MRO for the HO (switching with frequency or alien frequencies) in LTE.Various error situation is as follows, and wherein IRAT represents interactive RAT:

IRAT is excessively late-and the threshold requirement of Serving cell arranges too low, thus cause UE before measurement report can start or HO can perform, move to outside Serving cell;

IRAT too early-threshold requirement of Target cell is too low, thus causes HO failure, or, RLF occurs after HO soon;

Soon, there is RLF, thus cause rebuilding in the 3rd RAT in IRAT to wrong RAT (IRATwrongRAT)-after HO to another RAT;

IRAT is frequent-and the requirement of Serving cell arranges too definite, even if may carry out HO in LTE, also can cause interactive RATHO;

IRAT table tennis (pingpong)-when UE changes RAT, compared with the requirement of cell-of-origin, the requirement of Target cell is too low;

The quick HO-of IRAT is after HO, and quick HO is to another RAT.

Can suppose, " IRAT is excessively late " is topmost failure scenarios, is at least such in the starting stage, because the coverage of LTE system is unbalanced, if HO can suffer failure when legacy system does not carry out in time." IRAT is excessively late " event meets with RLF, returning to idle mode in the cell by calculating UE and attempts to find the number of times of new community to measure in another RAT.

MRO in the existing LTE of suggestion expansion, so that exchange message (such as, NGMN alliance, handover optimization) between the network node in different RAT.In the example of " IRAT is excessively late ", this represents, the community that UE attempts to connect after RLF will receive the report of the Serving cell details before about failure from UE.Then, this eNB needs the eNB message being similar to " RLF instruction " being sent to the community that process UE is connected to before RLF.As mentioned above, RAN information management (RIM) Application of Interface is in carrying out the information transmission between different RAT.

In order to collect and exchange message in RAT, each RAT must decode to the information from UE reception and about another RAT, and sends this information with the form of generally acknowledging between RAT.

In addition, the most possible network interface used is RIM.This interface has been common to other purposes, to communicate between each RAT, but wherein requires that signaling should limit.The reason of this restriction is the process complexity of core net node.Therefore, this interface is used for inter-rat MRO also may have problems.

Therefore, need a kind of method that information is provided in cellular radio communication system, to relax or to solve the problems of the prior art.

Summary of the invention

The object of this invention is to provide a kind of method relaxing or solve the problems of the prior art.Another object of the present invention is to provide and a kind of improves interactive RATHO problem detection, reduces signaling, and with the method for existing cellular communications system compatibility.Another object of the present invention is to provide a kind of alternative method providing information in cellular radio communication system.

According to an aspect of the present invention, described object is realized by a kind of method of information that provides in cellular radio communication system, each community in wherein said cellular radio communication system is served by base station, and supports the wireless access technology (RAT) of the radio communication be used between community and the one or more travelling carriages being connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage can from a cell merge to another community supporting different radio access technologies (RAT), and adopt one to reconnect flow process further, when being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of a community, can attempt reconnecting to another community supporting different radio access technologies (RAT), said method comprising the steps of:

-when being connected to the first community, detect the Radio Link Failure (RLF) of travelling carriage;

-in the second community, rebuild connection; And

-only support that the community of same wireless access technology (RAT) provides the information about described Radio Link Failure (RLF) to described first community and/or the 3rd community, before wherein said 3rd community is described first community of connection, the community that described travelling carriage is connected to.

Dependent claims 2 to 16 discloses the above-mentioned embodiment about the method in cellular radio communication system.

According to a further aspect in the invention, described object also by a kind of for providing the method in the travelling carriage of information to realize in cellular radio communication system, each community in wherein said cellular radio communication system is served by base station, and supports the wireless access technology (RAT) of the radio communication be used between community and the one or more travelling carriages being connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage can from a cell merge to another community supporting different radio access technologies (RAT), and adopt one to reconnect flow process further, when being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of a community, can attempt reconnecting to another community supporting different radio access technologies (RAT), said method comprising the steps of:

-when being connected to the first community, detect Radio Link Failure (RLF);

-in the second community, rebuild connection; And

According to another aspect of the invention, described object also by a kind of for providing the method in the base station of information to realize in cellular radio communication system, each community in wherein said cellular radio communication system is served by base station, and supports the wireless access technology (RAT) of the radio communication be used between community and the one or more travelling carriages being connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage can from a cell merge to another community supporting different radio access technologies (RAT), and adopt one to reconnect flow process further, when being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of a community, can attempt reconnecting to another community supporting different radio access technologies (RAT), said method comprising the steps of:

-when travelling carriage is connected to the first community, receive Radio Link Failure (RLF) report about the Radio Link Failure (RLF) of described travelling carriage; And

If same wireless access technology (RAT) is supported in-described base station and described first community or the 3rd community, then provide the information about described Radio Link Failure (RLF) to described first community and/or described 3rd community, before wherein said 3rd community is described first community of connection, the community that described travelling carriage is connected to.

According to an embodiment of the method in above-mentioned base station, described in provide the step of information to comprise:

-by described information transmission to the first base station serving described first community, or be transferred to the 3rd base station serving described 3rd community, this information transmission can directly be carried out, and also can carry out via one or more X2 and/or the S1 interfaces on other base stations one or more in described cellular radio communication system.

Method in above-mentioned travelling carriage and base station can be modified according to the different embodiments of the method about cellular radio communication system.

The invention still further relates to a kind of computer program and a kind of computer program, when it runs in a computer, computer can be made to perform the method in above-mentioned travelling carriage and the method in base station.

In accordance with a further aspect of the present invention, described object also by a kind of for providing the mobile station apparatus of information to realize in cellular radio communication system, each cell arrangements in wherein said cellular radio communication system becomes to be served by base station, and supports the wireless access technology (RAT) of the radio communication be used between community and the one or more travelling carriages being connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage can from a cell merge to another community supporting different radio access technologies (RAT), and adopt one to reconnect flow process further, when being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of a community, can attempt reconnecting to another community supporting different radio access technologies (RAT); Described mobile station apparatus is used for:

-when being connected to the first community, detect Radio Link Failure (RLF);

-in the second community, rebuild connection; And

According to a further aspect of the invention, described object also by a kind of for providing the base station apparatus of information to realize in cellular radio communication system, each cell arrangements in wherein said cellular radio communication system becomes to be served by base station, and supports the wireless access technology (RAT) of the radio communication be used between community and the one or more travelling carriages being connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage can from a cell merge to another community supporting different radio access technologies (RAT), and adopt one to reconnect flow process further, when being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of a community, can attempt reconnecting to another community supporting different radio access technologies (RAT), described base station apparatus is used for:

Also can arrange according to the different embodiments of said method according to mobile station apparatus of the present invention and base station apparatus.

By using current solution, then may support interactive RATMRO, and without the need to introducing signaling between different RAT, also how should can be reported in the mechanism of the RLF event occurred in different RAT about UE without the need to setting.

The present invention has following dominance effect further: can carry out interactive RATRLF problem detection, such as about the detection of switching problem, also the signaling of this content can be sent to original source community, can take correction measure, in avoiding later interactive RAT to switch, same problem occurs in described original source community; Process some interactive RAT failed handoff scenario, especially " IRAT is excessively late ", " IRAT is too early ", " IRAT is to wrong RAT " (IRATwrongRAT); Only affect the LTE signaling capability of UE and eNB; Avoid any signaling from a RAT to another RAT, such as, use RIM flow process, thus avoid the core network element of two RAT produces extra duty; Compared with prior art solution, less on the impact of 3GPP standard convention; Only affect LTE standard specification; By having the X2 interface of suitable extender, such as, RLF Indication message or handover report message, reuse existing procedure; And be applicable to be switched to non-3 gpp RAT, such as, WiMax or Wi-Fi.

Other advantages of the present invention and application will be expressed hereinafter.

Accompanying drawing explanation

Accompanying drawing is intended to illustrate and explain every embodiment of the present invention, wherein:

-Fig. 1 illustrates the typical cell sight carrying out cell measurement;

-Fig. 2 illustrates the present invention in the exemplary embodiment of IRAT too early and in the late situation of mistake; And

-Fig. 3 illustrates the exemplary embodiment of the present invention in IRAT to RAT mistake (IRATtowrongRAT) situation.

Embodiment

As mentioned above, the invention provides a kind of identification interactive RATRLF problem, such as HO problem, and this information is forwarded to the method for original source community.

Therefore, the present invention relates to a kind of for providing the method for information in cellular radio communication system, each community in wherein said cellular radio communication system is served by base station (BS), and this represents that each community includes the BS serving this community.In addition, the RAT of the radio communication be used between community and the one or more MS being connected to this community is supported in each community.System adopts a kind of switching flow, and wherein MS can from a cell merge to another community supporting different RAT.System adopts one to reconnect flow process further, when being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of a community, can attempt reconnecting to another community supporting the wireless access technology (RAT) different from the RAT that described community is supported.

Said method comprising the steps of: when MS is connected to the first community, detect the RLF of MS; The connection disconnected is rebuild in the second community; And only support that the community of identical RAT provides the information about RLF to the first community and/or the 3rd community.3rd community is before MS is connected to the first community, the community that described MS is connected to.

According to an embodiment, therefore the present invention relates to a kind of mechanism, and wherein MS determines cell-of-origin when there is RLF failure, and this information is only reported to the affiliated RAT community identical with cell-of-origin.Like this, the signaling requirement between different RAT reduces, in addition, without the need to transitional information between different RAT.Therefore, according to one embodiment of the present invention, MS, when returning the RAT identical with cell-of-origin, sends RLF report.

According to another embodiment of the present invention, it is one or more that RLF report comprises in the group be made up of following item, comprise: the community ID of the community ID of the measurement that combining wireless RLF performs on the community detected, the first community, the community ID of the second community, the 3rd community, and HO Fail Type.Good situation is, it is one or more that RLF report comprises in the group be made up of following item further, comprising: RAT type, carrier frequency, Location Area Code, and the Routing Area Code of each community in system.

According to another item embodiment of the present invention, transmitting step comprises: carry out transmission information via one or more X2 and/or the S1 interfaces on other middle BS one or more; And if information is transmitted via one or more X2 interface, then situation is that described information is included in RLF Indication message or HO report message preferably.

The behavior of each BS of each MS and BS/ of MS/ is slightly different, specifically depends on type of error, and therefore, the example scenarios of different type of error will be summarized hereinafter.Hereafter specifically describe about going out HO (outgoingHO), the LTERLF namely from LTE to another RAT, but technical staff it should be understood that the present invention is not limited to this situation.

But for LTE system, the present invention only affects the LTE signaling capability of UE and eNB; And such as by using RIM flow process, avoiding any signaling from a RAT to another RAT further, thus avoiding producing extra duty in the core network element of two RAT.UE must can record RLF failure details, and when being finally again connected to LTE system, can report these details.Therefore be less than prior art solution to the impact of 3GPP specification, this is advantage of the present invention.In addition, this method is also applicable to RLF, or the equivalent in non-3 gpp RAT, such as, WiMax or Wi-Fi.

Hereinafter, the exemplary embodiment of following situation is described: " IRAT is excessively late ", " IRAT is too early " and " IRAT is to wrong RAT.But ", as one of ordinary skill in the art recognize, the present invention is not limited to these embodiments, but relates to simultaneously and be incorporated to all embodiments within the scope of accompanying independent claim.

Exemplary embodiment: IRAT is excessively late

1UE is connected to the community 1 supporting that the eNB1 of RAT1 serves.UE moves to outside the coverage of community 1, wireless issue detected, and tries to find its community that can be connected to.After trying to find a period of time, UE returning to idle mode.

2 when being in Idle state, and UE detects another community (community 2) of adhering to different RAT (RAT2) from community 1 separately.UE is connected to this community 2, and keeps connecting a period of time ((2) see in Fig. 2).

3 is final, and UE retracts another community (community n) of RAT1.This community may be community 1 or other communities.UE remember its stored can send, about the RLF report of cell-of-origin in RAT1.This is reported to the eNB ((3) see in Fig. 2) RAT1 processing community n by UE.

4 eNB serving community n receive RLF report, read report, find the community ID of a Serving cell (community 1) (such as, EGCI), and when community difference (community 1 is different from community n), information is forwarded to the eNB ((4) see in Fig. 2) of process community 1.

5 cell-of-origins (community 1) research RLF report, and use described information to adjust moving parameter, such as, the threshold value of interactive RAT moving event.

Exemplary embodiment: IRAT is too early

1UE is connected to the community 1 supporting that the eNB1 of RAT1 serves.

2UE is switched to another community (community 2) belonging to another RAT (RAT2).Within time threshold (T_dwell) the determined a bit of time, UE detects wireless issue, and tries to find its community that can be connected to.After trying to find a period of time, UE returning to idle mode ((2) see in Fig. 2).

3 when being in idle pulley, and UE detects another community (community n) belonging to RAT1.This community may be community 1 or other communities.UE is connected to this community, and described UE recognizes, this community have can send, this is reported to about the RLF report UE of cell-of-origin in RAT1 the eNB ((3) see in Fig. 2) RAT1 serving community n.

4 eNB serving community n receive RLF report.This eNB reads this RLF report, find the EGCI of a Serving cell (community 1), and when community difference (community 1 is different from community n), information is forwarded to the eNB ((4) see in Fig. 2) serving community 1.

5 cell-of-origins (community 1) research report, and use described information to adjust moving parameter.

Exemplary embodiment: IRAT is to wrong RAT

1UE is connected to the community 1 supporting that the eNB1 of RAT1 serves.

2UE is switched to another community (community 2) belonging to another RAT (RAT2).Within time threshold (T_dwell) the determined a bit of time, UE detects wireless issue, and tries to find its community that can be connected to.After trying to find a period of time, UE returning to idle mode ((2) see in Fig. 3).

3 when being in Idle state, and UE detects another community (community 3) belonging to another RAT (RAT3).UE is connected to this community ((3) see in Fig. 3).

4 is final, and UE retracts another community (community n) of RAT1.This community may be community 1 or other communities ((4) see in Fig. 3).

5UE remember its stored can send, about the RLF report of cell-of-origin in RAT1.This is reported to the eNB ((5) see in Fig. 3) RAT1 serving community n by UE.

6 eNB serving community n receive RLF report.This eNB reads this RLF report, finds the EGCI of a Serving cell (community 1), and when community difference (community 1 is different from community n), information is forwarded to the eNB serving community 1.

7 cell-of-origins (community 1) research RLF report, and use described information to adjust moving parameter.

UE behavior

In order to determine type of error, UE must detect and store following community: before last HO, the community that UE is connected to; Before there is RLF because of HO failure, the community that UE is connected to; And after RLF, the wherein community that reconnects of UE.

In above-mentioned exemplary embodiment, different from MRO in LTE, UE is by comparing the time between HO and RLF and threshold value (T_dwell), thus part identification error type voluntarily indirectly, to determine whether to be considered as cell-of-origin (when " IRAT is excessively late ") by occurring the community of RLF, or whether the community before HO should be considered as cell-of-origin (when " IRAT is too early " or " IRAT is to wrong RAT ")." this is required, because UE must identify cell-of-origin voluntarily, to report to correct RAT.It should be noted that threshold value (T_dwell) is transferred to UE by this requirement.

Following community should be reported by UE, to support interactive RATMRO:

That the MS before error event of cell-of-origin-is wherein connected to and support the community of RAT1.

Target cell-wherein attempts carrying out HO but during HO or the community of RLF occurs afterwards soon.

The MS try reconstruct of final community-is wherein to the community of the connection of network.

List in table 1 under different error situation, the mapping between the community detected and the community of reporting.

Table 1: the mapping between the community detected and the community of reporting

It should be noted that other definition that may use reported community, this can cause different mappings.In addition, UE is a possibility detection resources community also, reports in which RAT to understand, and tale quale [present situation (asis)? ] report the community detected, and without the need to any mapping to final/Target cell.

UE is possibility identification error type completely also, and clearly this type of error is sent to eNB by signal.In order to distinguish between " IRAT is too early " and " IRAT mistake RAT ", UE only need reference source RAT whether with UE after RLF the RAT that attempts to reconnect to identical.

Interactive RAT information is collected by UE and reports

Except the content that the prior art measured according to interactive RAT collects RLF report, UE also can according to one embodiment of the present invention collect related detection to the information belonging to the community of other RAT.Described information should about failed cell-of-origin wherein occurs, because described information is passed to this community the most at last.

Cell-of-origin is before error event occurs, the community in that UE is connected to, RAT1.Owing to intending by this information reporting to the RAT belonging to cell-of-origin, therefore cell-of-origin uniquely identifies by the global identity (ID) of this RAT, such as, carry out unique identification by the EGCI in LTE system.

For Target cell and final community, wherein at least one community will belong to different RAT (or event is not interactive RATMRO event).Only need with reference to specific interactive RAT measuring object ID, because this ID can point to the Proprietary Information of adjacent R AT, such as carrier frequency, uses when wherein said ID is measured on other RAT by UE.But in view of each UE all configures, and due to the report from UE possibly cannot arrive immediately after the failure, and cannot always require this information to preserve in the enb, therefore mode that may be more suitable is, by clearly sending RAT type and carrier frequency by signal in systems in which, thus so that the mode of self-demarking code information can be stored.

Similar discussion is applicable to community ID.Because the list of neighbor cell can be delivered to UE, therefore only may need report and wherein UE is attempted to carry out the index (for neighbor cell list) of the community reconnected, but because information may can not be preserved in the enb, therefore according to one embodiment of the present invention, community ID may clearly report in systems in which.The example of the information that may comprise is:

Carrier frequency E-UTRA Absolute Radio Frequency Channel Number (EARFCN).

RAT type, such as UTRAN/GERAN/CDMA2000.

Community ID.

But in some cases, physical district ID should be enough to identify Target cell and final community.An example of this situation is, because source eNB is required that HO arrives this community, therefore Target cell is usually known in cell-of-origin.Therefore, according to another example of the present invention, a kind of may be the physical I D of a reporting objectives and/or final community.

But final community may not known to cell-of-origin.And Target cell may be deleted from the Neighboring Relation Table (NRT) cell-of-origin.Therefore, alternatively, use final community and/or the World Wide ID for Target cell always.

When UE does not perform any mapping (described in the substituting solution as mentioned in the above) of target/final community, UE reports needing the community detected, that is:

Before last HO, the community that UE is connected to.

Before RLF, the community that UE is connected to.

After RLF, the wherein community that reconnects of UE.

But in this case, UE cannot distinguish between cell-of-origin/Target cell/final community, and report therefore will be needed about the complete information of all communities, that is:

Carrier frequency EARFCN.

RAT type, such as UTRAN/GERAN/CDMA2000.

Community ID.

As further improvement, information also can carry out expanding to minimize the demand measured UE Automatic Neighboring Relation (ANR).In this case, the information of collecting for target and final community is when GERAN detected cells, always should comprise CGI and the Routing Area Code (RAC) of the neighbor cell detected, when UTRAN detected cells, always should comprise CGI, LAC and RAC, and when CDMA2000 detected cells, always CGI should be comprised.

Another kind may be, uses the available information in measuring object definition (definition as in 3GPP specification TS36.331) to determine whether reporting the above-mentioned measurement about ANR.In LTE, there is a cell list, list the community (cellForWhichToReportCGI) of the CGI of report UTRAN and GERAN neighbor cell.

The anticipatory behavior of the eNB of information is received from UE

Assuming that there is another kind of suitable solution, the program also can make UE report RLF report after returning Idle state.

A solution is, from UE receive information eNB read cell-of-origin EGCI, and if this community by different e NB process, then information is forwarded to process cell-of-origin eNB.This forwarding, by realizing with under type, namely uses X2 interface and creates new information unit, or adds extraneous information to the existing RLF Indication message in LTE system or RLF report message.Required extraneous information is the summarized RAT information about Target cell and final community above:

Carrier frequency.

RAT type.

Community ID.

About the information (optional) of ANR.

Another kind may be, via S1 interface forwarding information.

Alternatively solution, receives eNB and not only information can be forwarded to the eNB serving cell-of-origin, and described information can be forwarded to the eNB serving target/final community, because point out these communities to be favourable for error event.

When UE does not perform any mapping (as mentioned above), or when not using in from the message of UE signal to send any clear and definite cell-of-origin, the information that eNB must use UE to report, execution error type detection voluntarily, to determine cell-of-origin.After completing detection, information can be forwarded to cell-of-origin by eNB.In this case, UE only need collect and the information reported about following content:

Before last HO, the community that UE is connected to.

Before RLF, the community that UE is connected to.

After RLF, the wherein community that reconnects of UE.

Elapsed time between last HO and RLF.

According to this embodiment, the information of concerned cell should comprise RAT information (as hereinbefore defined), and UE be connected to before attempting to reconnect to RLF, community in same RAT time, only report this information.Then, this information is forwarded to the eNB serving community by the eNB receiving this information, described community be RLF before the community that is connected to of UE.This eNB can use provided information to determine type of error, and performs and similar mapping mentioned above the community detected and the community of reporting.

If at RLF not long ago, any HO does not occur, then type of error is " IRAT is excessively late ", and the community that before RLF, UE is connected to is actual is equal to cell-of-origin.Therefore, under this special case, can directly use the detection of this error situation to adjust interactive RAT moving parameter, and without the need to carrying out any extra information transmission.

On the other hand, if Ho not long ago occurring at RLF, then type of error was " IRAT is too early " or " IRAT mistake RAT "; And cell-of-origin be last HO before the community that is connected to of UE.In this case, information must by being similar to the Message Transmission of the HO report in LTE in MRO to cell-of-origin.Compared with current LTEMRO solution, a difference is, this message may need to be sent to another RAT, and must be included about the RAT information of all three communities detected.For UE, although this solution is comparatively easy, but still need on RAT, to resend message, to carry out the detection of all error situations.

With reference to above-mentioned about a kind of for providing the embodiment of the method for information in cellular radio communication system, the invention still further relates to a kind of method in MS and in BS.

Method in MS comprises the following steps: when being connected to the first community, detects RLF; Rebuild in the second community that the 2nd BS serves and connect; And only support that the community of identical RAT provides the information about RLF to the first community and/or the 3rd community, and before wherein the 3rd community is connection first community, the community that MS is connected to.

Method in BS comprises the following steps: the RLF report receiving the RLF of the MS about being connected to the first community; And if BS supports identical RAT with the first community or the 3rd community, then provide the information about RLF to the first community and/or the 3rd community, before wherein the 3rd community is connection first community, the community that MS is connected to.

According to an embodiment of the method in above-mentioned BS, the step of information is provided to comprise: by information transmission to the BS serving the first community, or be transferred to the 3rd BS serving the 3rd community, this information transmission can directly be carried out, and also can carry out via one or more X2 and/or the S1 interfaces on other BS one or more in communication system.

Method in above-mentioned MS and in BS can be modified according to the different embodiments of the method in above-mentioned cellular radio Communication system.

In addition, those skilled in the art will appreciate that, can implement in the computer program with coding component according to the method in MS of the present invention and the method in BS, when described computer program runs in a computer, computer can be made to perform each step of the method.Computer program is contained in the computer-readable media of computer program.Computer-readable media can be made up of any memory substantially, such as ROM (read-only memory), PROM (programmable read only memory), EPROM (erasable PROM), flash memory, EEPROM (electric erasable PROM) or hard disk drive.

And, the invention still further relates to a kind of MS device and a kind of BS device.MS and BS device can be and is applicable to any relevant RAT system of the present invention, such as, any suitable device in LTE, UMTS, CDMA2000, WiMaX, Wi-Fi or GERAN.Therefore, may MS be UE, MS or SS [SS? ], and BS may be eNB, NodeB or BTS.

MS device is used for: when being connected to the first community, detects RLF;

Rebuild in the second community that the 2nd BS serves and connect; And only support that the community of identical RAT provides the information about RLF to the first community and/or the 3rd community, and before wherein the 3rd community is connection first community, the community that MS is connected to.

BS device is used for: receive the RLF report that MS is connected to the relevant RLF of the first community; And if BS supports identical RAT with the first community or the 3rd community, then provide the information about described RLF to the first community and/or the 3rd community, before wherein the 3rd community is connection first community, the community that MS is connected to.

MS device of the present invention and BS device also can be arranged according to the different embodiments of the either method in disclosed method.

The embodiment of the present invention provides a kind of method providing information in cellular radio communication system, each community in wherein said cellular radio communication system is served by base station, and supports the wireless access technology (RAT) of the wireless telecommunications be used between community and the one or more travelling carriages being connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage can from a cell merge to another community supporting different radio access technologies (RAT), and described cellular radio communication system adopts one to reconnect flow process further, when being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of a community, can attempt reconnecting to another community supporting different radio access technologies (RAT), said method comprising the steps of:

When being connected to the first community, detect the Radio Link Failure (RLF) of travelling carriage;

Rebuild in the second community and connect; And

Only support that the community of same wireless access technology (RAT) provides the information about described Radio Link Failure (RLF) to described first community and/or the 3rd community, before wherein said 3rd community is described first community of connection, the community that described travelling carriage is connected to.

According to a kind of implementation of this embodiment, wherein said information comprises Radio Link Failure (RLF) report that described travelling carriage generates.

According to a kind of implementation of this embodiment, wherein said Radio Link Failure (RLF) report comprises following one or more: the cell ID (ID) of the cell ID (ID) of the measurement that on the community that detect perform relevant to described Radio Link Failure (RLF), described first community, the cell ID (ID) of described second community, described 3rd community, and handoff failure type.

According to a kind of implementation of this embodiment, wherein said Radio Link Failure (RLF) report comprises following one or more further: the Location Area Code of each community that the carrier frequency of each community that wireless access technology (RAT) type of each community that described Radio Link Failure (RLF) report comprises, described Radio Link Failure (RLF) report comprise, described Radio Link Failure (RLF) report comprise, and the Routing Area Code of each community that described Radio Link Failure (RLF) report comprises.

According to a kind of implementation of this embodiment, if wherein same wireless access technology (RAT) is supported in the 4th community and described first community and/or the 3rd community, then described information is transferred to the 4th base station serving described 4th community by described travelling carriage, after described 4th community is described Radio Link Failure (RLF), the community that described travelling carriage is connected to, wherein said 4th community is the arbitrary community in described first, second or the 3rd community, or other communities.

According to a kind of implementation of this embodiment, should in cellular radio communication system, provide the method for information further comprising the steps:

By described 4th base station by described information transmission to serving the first base station of described first community and/or serving the 3rd base station of described 3rd community.

According to a kind of implementation of this embodiment, wherein said transmitting step comprises:

In described cellular radio communication system, transmit described information via other base stations one or more by one or more X2 and/or S1 interface.

According to a kind of implementation of this embodiment, if wherein described information is transmitted via described one or more X2 interface, then described packets of information is contained in Radio Link Failure (RLF) Indication message or handover report message.

According to a kind of implementation of this embodiment, same wireless access technology (RAT) is not all supported in wherein said first, second, and third community.

According to a kind of implementation of this embodiment, wherein said travelling carriage based on before occurring at described Radio Link Failure (RLF), the time period that described travelling carriage is connected to described first community determine whether described information to be sent to described first or the 3rd community support the community of same wireless access technology (RAT).

According to a kind of implementation of this embodiment, if the time period that wherein described travelling carriage is connected to described first community exceedes time of staying threshold value, then described information is sent to the community supporting same wireless access technology (RAT) with described first community, otherwise described information is sent to the community supporting same wireless access technology (RAT) with described 3rd community.

According to a kind of implementation of this embodiment, wherein said time of staying threshold value is sent to described travelling carriage from base station, or predetermined.

According to a kind of implementation of this embodiment, wherein said information is only supplied to the community supporting same wireless access technology (RAT) with described first community.

According to a kind of implementation of this embodiment, wherein said information is only supplied to the community supporting same wireless access technology (RAT) with described 3rd community.

According to a kind of implementation of this embodiment, the base station wherein serving described first community and/or the base station serving described 3rd community use described information to adjust one or more moving parameter.

According to a kind of implementation of this embodiment, the wireless access technology (RAT) of more than two or two in the group that wherein said cellular radio communication system support is made up of following wireless access technology (RAT) item, comprising: LTE, UMTS, CDMA2000, WiMaX, Wi-Fi and GERAN; Described base station is any one in the group be made up of following item, comprising: eNB, NodeB and BTS; And described travelling carriage is any one in the group be made up of following item, comprising: user equipment (UE), mobile station MS and SS.

The embodiment of the present invention provides a kind of method for providing in cellular radio communication system in the travelling carriage of information, each community in wherein said cellular radio communication system is served by base station, and supports the wireless access technology (RAT) of the radio communication be used between community and the one or more travelling carriages being connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage can from a cell merge to another community supporting different radio access technologies (RAT), and described cellular radio communication system adopts one to reconnect flow process further, when being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of a community, can attempt reconnecting to another community supporting different radio access technologies (RAT), said method comprising the steps of:

When being connected to the first community, detect Radio Link Failure (RLF);

Rebuild in the second community and connect; And

The embodiment of the present invention provides a kind of method for providing in cellular radio communication system in the base station of information, each community in wherein said cellular radio communication system is served by base station, and supports the wireless access technology (RAT) of the radio communication be used between community and the one or more travelling carriages being connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage can from a cell merge to another community supporting different radio access technologies (RAT), and described cellular radio communication system adopts one to reconnect flow process further, when being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of a community, can attempt reconnecting to another community supporting different radio access technologies (RAT), said method comprising the steps of:

Receive Radio Link Failure (RLF) report about the Radio Link Failure (RLF) of described travelling carriage when MS is connected to the first community; And

If same wireless access technology (RAT) is supported in described base station and described first community or the 3rd community, then provide the information about described Radio Link Failure (RLF) to described first community and/or described 3rd community, before wherein said 3rd community is described first community of connection, the community that described travelling carriage is connected to.

According to a kind of implementation of this embodiment, wherein said information providing step comprises:

By described information transmission to the first base station serving described first community, or be transferred to the 3rd base station serving described 3rd community, information transmission is directly carried out, or is undertaken by one or more X2 and/or S1 interface by other base stations one or more in described cellular radio communication system.

The embodiment of the present invention provides a kind of computer program, it is characterized in that, coding component, when described coding component runs in a computer, makes described computer perform said method.

The embodiment of the present invention provides a kind of computer program, it comprises computer-readable media and above computer program, wherein said computer program is included in described computer-readable media, and is made up of one or more in the following: ROM (read-only memory), PROM (programming ROM), EPROM (erasable PROM), flash memory, EEPROM (electric EPROM) and hard disk.

The embodiment of the present invention provides a kind of for providing the mobile station apparatus of information in cellular radio communication system, each cell arrangements in wherein said cellular radio communication system becomes to be served by base station, and supports the wireless access technology (RAT) of the radio communication be used between community and the one or more travelling carriages being connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage can from a cell merge to another community supporting different radio access technologies (RAT), and described cellular radio communication system adopts one to reconnect flow process further, when being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of a community, can attempt reconnecting to another community supporting different radio access technologies (RAT); Described mobile station apparatus is used for:

When being connected to the first community, detect Radio Link Failure (RLF);

Rebuild in the second community and connect; And

The embodiment of the present invention also provides a kind of for providing the base station apparatus of information in cellular radio communication system, each cell arrangements in wherein said cellular radio communication system becomes to be served by base station, and supports the wireless access technology (RAT) of the radio communication be used between community and the one or more travelling carriages being connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage can from a cell merge to another community supporting different radio access technologies (RAT), and described cellular radio communication system adopts one to reconnect flow process further, when being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of a community, can attempt reconnecting to another community supporting different radio access technologies (RAT); The feature of described base station apparatus is, described base station apparatus is used for:

Claims

1. a method for information is provided in cellular radio communication system, said method comprising the steps of:

When being connected to the first community, detect the Radio Link Failure (RLF) of travelling carriage, a kind of wireless access technology (RAT) is supported in described first community;

Rebuild in the second community and connect, different wireless access technologys (RAT) is supported in described second community; And

To with described first community, described travelling carriage only supports that the 4th community of same wireless access technology (RAT) provides the information about described Radio Link Failure (RLF);

Wherein said information comprises Radio Link Failure (RLF) report that described travelling carriage generates;

Wherein said Radio Link Failure (RLF) report comprises:

Wireless access technology (RAT) type of described second community and the carrier frequency of described second community.

2. method according to claim 1, wherein said Radio Link Failure (RLF) report comprises following one or more further: the cell ID (ID) of the measurement that on the community that detect perform relevant to described Radio Link Failure (RLF), the 3rd community, and handoff failure type, wherein said 3rd community connects the community that described travelling carriage is connected to before described first community.

3. method according to claim 1, wherein said Radio Link Failure (RLF) report comprises the physical district ID of described second community further.

4. the method according to claim arbitrary in claims 1 to 3, described travelling carriage by described information transmission to the 4th base station serving described 4th community.

5. one kind for information is provided in cellular radio communication system mobile station apparatus described in mobile station apparatus for:

When being connected to the first community, detect Radio Link Failure (RLF), a kind of wireless access technology (RAT) is supported in described first community;

Only support that the 4th community of same wireless access technology (RAT) provides the information about described Radio Link Failure (RLF) to described first community;

Wherein said Radio Link Failure (RLF) report comprises:

6. mobile station apparatus according to claim 5, described mobile station apparatus by described information transmission to the 4th base station serving described 4th community.

7. one kind for providing the method in the base station apparatus of information in cellular radio communication system, when travelling carriage is connected to the first community, Radio Link Failure (RLF) detected, rebuild in the second community and connect, a kind of wireless access technology (RAT) is supported in wherein said first community, different wireless access technologys (RAT) is supported in described second community, said method comprising the steps of:

Described travelling carriage is connected to described base station apparatus,

When described base station apparatus be positioned to support the 4th community of same wireless access technology (RAT) with described first community time, described base station apparatus is for receiving the information about described Radio Link Failure (RLF);

Wherein said Radio Link Failure (RLF) report comprises:

8. method according to claim 7, described base station apparatus is also for being transferred to the first base station serving described first community by described radio link failure information.

9. one kind for providing the base station apparatus of information in cellular radio communication system, when travelling carriage is connected to the first community, Radio Link Failure (RLF) detected, rebuild in the second community and connect, a kind of wireless access technology (RAT) is supported in wherein said first community, and different wireless access technologys (RAT) is supported in described second community;

Described travelling carriage is connected to described base station apparatus,

Wherein said Radio Link Failure (RLF) report comprises:

10. a cellular radio communication system, is characterized in that, described system comprises base station apparatus as claimed in claim 8 and mobile station apparatus according to claim 6.